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International Journal of Automotive Technology > Volume 19(6); 2018 > Article
International Journal of Automotive Technology 2018;19(6): 1103-1110.
COOLING EFFICIENCY ACCORDING TO SHAPE CHANGES TO THE STRAIGHT VENTILATION HOLE IN CARBON-CERAMIC BRAKE DISKS
Dong Guk Ko1, Hamada Mohamed Abdelmotalib1, Ik-Tae Im1, Dong Won Im2, Suck Ju Yoon1
1Chonbuk National University
2DACC Carbon
PDF Links Corresponding Author.  Suck Ju Yoon , Email. mecysj@jbnu.ac.kr
ABSTRACT
In this study, in order to examine the cooling efficiency of a carbon-ceramic brake disk, the temperature distribution of the disk, depending on the AMS (Auto-Motor-Sport) Fade mode, was analyzed using a numerical method. Two brake disks with different straight ventilation hole shapes were considered. The ventilation holes configuration was changed from base models in order to find a higher cooling efficiency disk design. In the Model A disk, the mean temperatures of the mid-plane and the entire disk, at the AMS Fade mode end time decreased 1.9 oC and 3 oC, hole length respectively. This was done by decreasing the length of the a2 hole from 94 mm to 59 mm. When a2 hole length was increased from 94 mm to 128 mm, the mean temperature of the entire disk and the disk mid-plane increased 3.7 oC and 16.2 oC, respectively. This was due to the increased affined air stagnation in the disk. In the Model B disk, after removing stagnation region of the b2 hole, the hole diameter expanded from 13 mm to 17.6 mm. As a result, the mean temperature of the entre disk and the mid-plane decreased 2.8 oC and 18.7 oC, respectively, (compared to the base model). As a result, increasing the surface area of the ventilation holes gave a higher cooling efficiency.
Key Words: AMS fade mode, Carbon ceramic brake disk, Computaional heat transfer, Cooling efficiency, Ventilation hole
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